吸水膨胀树脂复合堵漏剂的研发与性能评价
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中石化重大科技项目群“顺北油气田一区优快钻井技术研究”(项目编号P18021-2)


Development and Evaluation of Composite Plugging Agent of Water-absorbent Swelling Resin
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    摘要:

    针对钻井堵漏中吸水树脂堵漏剂承压能力低、单一刚性颗粒碳酸钙难于堵漏、它们的颗粒大小与漏失裂缝 尺寸难以匹配,均不能很好堵漏的问题,以丙烯酸(AA)、丙烯酰胺(AM)和2-丙烯酰胺基-2-甲基丙磺酸(AMPS) 为单体,N,N-亚甲基双丙烯酰胺为交联剂,过硫酸铵-亚硫酸氢钠为引发剂进行聚合反应,再通过烘干、粉碎、过 筛处理制备了粒径(mm)<1.00、1.00~<2.80、2.80~<4.75和4.75~<8.00的4种树脂,将该树脂与膨润土、超 细碳酸钙、石棉纤维和5种粒径非球形碳酸钙颗粒进行复配,通过1~4 mm缝隙板的堵漏效果评价,优选堵漏材 料的粒径和加量,形成了一种复合堵漏配方。研究结果表明:该树脂颗粒在15~30 min内吸水膨胀,在淡水和 6.0%氯化钠溶液中360 min吸液倍率分别达102~234 g/g和17~23 g/g。形成的复合堵漏剂用淡水和聚磺钻井 液稀释配制的密度为1.37 g/cm3 的堵漏浆对1~4 mm缝隙板可完全封堵,在6.9 MPa下可承压10 min,具有良好 的堵漏效果。

    Abstract:

    The pressure bearing capacity of water-absorbent swelling resin plugging agent was poor,while the single rigid particles of calcium carbonate can't plug well,and their particle size can't match with the size of lost circulation fracture,which can't meet the requirements of plugging in drilling plugging. In this paper,four kinds of resins with particle size(mm)< 1.00,1.00~<2.80,2.80~ <4.75 and 4.75~<8.00 were obtained by polymeration reaction,using acrylic acid(AA),acrylamide(AM)and 2-acrylamido-2- methylpropanesulfonic acid(AMPS)as monomers,N,N- methylenebisacrylamide as crosslinking agent,ammonium persulfate sodium bisulfite as initiator,and the drying,crushing and screening treatment. The resin with 4 kinds of particle sizes was compounded with bentonite,ultra- fine calcium carbonate,asbestos fiber and 5 kinds of non spherical calcium carbonate particles. Through the evaluation of plugging effect of gap plate with gap width of 1—4 mm,the particle size and dosage of plugging material were optimized,and a compound plugging formula was formed. The results showed that the resin particles swelled in 15—30 min, and the absorbency of fresh water and 6.0% sodium chloride solution reached 102—234 g/g and 17—23g/g in 360 min,respectively. The compound plugging agent was diluted with fresh water and polysulfonated drilling fluid,and the plugging slurry with density of 1.37 g/cm3 could completely plug the gap plate with gap width of 1—4 mm,and could bear pressure for 10 min under 6.9 MPa, expressing good plugging effect.

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  • 在线发布日期: 2021-07-06
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